To debug situation, I downgraded one of my routerts to 6.44 lts release with netinstall. I made the same configuration and the problem persists.
I give following information to help you understand the my environment.
Currently one of my router has the ip address 192.168.10.2 and the lan gateway/firewall (opnsense) is 192.168.10.1. They are connected to the same unmanaged switch. I have not added any specific configuration other than what is available mikrotik wisp ap quickset menu. I selected bridge mode (no router mode) under wisp ap mode configuration. Mikrotik router is connected to the unmanaged switch with single ethernet cable on port-1.
I can not simply ping 192.168.10.1 from the mikrotik router by opening a terminal. How is this possible?
Dhcp client, which I added later, by your suggessiton can not access default gateway. It is always in search mode. My computer is attached to the same unmanaged switch which the mikrotik router and firewall connected. I can ping both from my pc, login to miktorik via winbox/webfig etc. My computer and all other devices, which are attached to unmanaged switch can reach gateway/firewall but mikrotik router can not.
However wireless connection works and forwards wireless clients properly to the gateway/firewall.
I will go crazy and rip my hair off.. I really do not understand what is wrong in such a basic configuration and what and why else must be done. Even though I am newbie in mikrotik, I am not in networking even though it is not my profession.
I exported configuration via /export and it is below. It is interesting that even though all ports are supposed to be bridged ether1 port is still marked as WAN. I made it LAN, the problem still persists.
# jan/02/1970 01:28:43 by RouterOS 6.44.6
# software id = 35BK-EUXW
# model = RouterBOARD 962UiGS-5HacT2HnT
set [ find default-name=wlan1 ] band=2ghz-onlyn disabled=no frequency-mode=\
superchannel mode=ap-bridge ssid=XXX
set [ find default-name=wlan2 ] band=5ghz-a/n/ac disabled=no frequency=5220 \
frequency-mode=superchannel mode=ap-bridge ssid=XXX2 wireless-protocol=\
/interface wireless security-profiles
set [ find default=yes ] authentication-types=wpa2-psk mode=dynamic-keys \
supplicant-identity=MikroTik wpa-pre-shared-key="xxxxxxxxxxxxx" \
/ip hotspot profile
set [ find default=yes ] html-directory=flash/hotspot
/interface bridge port
add bridge=bridge1 interface=ether1
add bridge=bridge1 interface=ether2
add bridge=bridge1 interface=ether3
add bridge=bridge1 interface=ether4
add bridge=bridge1 interface=ether5
add bridge=bridge1 interface=sfp1
add bridge=bridge1 interface=wlan2
add bridge=bridge1 interface=wlan1
/interface list member
add interface=ether1 list=WAN
add interface=ether2 list=LAN
add interface=ether3 list=LAN
add interface=ether4 list=LAN
add interface=ether5 list=LAN
add interface=sfp1 list=LAN
add interface=wlan2 list=LAN
add interface=wlan1 list=LAN
add address=192.168.10.2/24 interface=bridge1 network=192.168.10.0
add dhcp-options=hostname,clientid disabled=no interface=bridge1
add distance=1 gateway=192.168.10.1